Quote:
Originally Posted by Ky0t3
we had the same problem, we tried taking the gearboxes apart multiple times but nothing helped. We just had our programmer compensate, I think thats the only way to fix it.
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...why are you yelling?
lopsided98 is right if you're using PWM. That might help normalize it.
What you were alluding to is the fact that CIMs (like many motors) are slightly more efficient in one direction then the other (a direction bias). When you move forward one side of your robot has the CIMs spinning clockwise and the other side has motors that spin counter-clockwise. So one side will take advantage of operating in it's bias while the other side won't.
Also traditionally your robot's chassis would change over the season creating even more asymmetric characteristics. But then again this year's game doesn't really allow for robot contact, so this this might not hold true this year.
Experienced teams will use encoders, gyro, and other forms of feedback to keep the robot going straight. It's a normal part of the challenge of making a great robot.